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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71c24fb7c824cd7920a83722e1889305ce6ea698d7fc0fc8c3ae45fbcc9165c' 
  AND token = 'FeUBR1QmN8OSed1d9uJD4QKAzghB8Y9RFgC523swgzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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