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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80396fe3f1aba7336eb03c1f05eaa79feb3874b00dfe6cc8b5b457b42a34d49' 
  AND token = 'fE3wJByndybdfqjrWByLkaVWgYv/RIFMhJkoB6hE+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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