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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b84bf39a7e9b64d9f9fbcd4bb3585cec0f0b307cba2805da5c34725bdf8aa03' 
  AND token = 'gd0lhLQ0tIGpWz9vFaA4K+EE/HyRSL2sMiG6tIzDT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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