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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb764196d85a758420cb97a267bb3272657c316698694d80179a45c25bf519dc' 
  AND token = 'F2yU4FQSPyRDQ8hNnf+k6oRyoDEWFt4P1Ks/eNlz8f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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