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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fcdba8033fbac5174eb95b59a2a3a731a1638e3121e44cc54a431c9526334f' 
  AND token = 'WHVj7K+Nl8O68vnzdLN5yK875S8UJpjC0iiDFop4UPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}