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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3ba04793fc5abc674b8ea0d093a5232f45647899c50aae88621a00e75ac337' 
  AND token = '9rA4ZMJQm5n/cAATnlNsfv2YaZQUagKryZGpnrfV3Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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