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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d7450b54ce91e7862d36d56ae8f6d7d7d6107f0abd4d7e5fee8145a4dbab29' 
  AND token = 'kMywcbB7/nN5nATgLIsPAWqQv2eUZ8knuYMh9QOJ0Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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