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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7f01de998862d7c62ea9d69850409f4b453ce93b141c65ea4e6fa0d3219664' 
  AND token = 'bczbWgvpcltnxNKA+Ucr8EYMh1Nmthm/Ot+mz9PpLys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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