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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb41b65357398a3f94cff475ef733bd8324f4954e9b29a2d456978c48003f367' 
  AND token = 'p5+luMgFOF3tbpSK7jOd7GT9rF7Es1dHzjYH3sD7qvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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