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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7172d616a65daae8caab45e9b3478d1473dfddd9a504615497c3f854a347760e' 
  AND token = '9Ma6IW1eqBXMdW1FyhH9TnOQTBAxG7Za1S+nyb++hMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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