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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b856484fde1610ed97aaa3770c4bf6772dcdf110d8000b6e726cc39894e41b8' 
  AND token = 'imNY7PNARbeVemQWshwvMooSaU9YdPvr8cxKDuRO2QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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