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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334f248ae856d0f2880471930de8a8a8d460870fc075d78f348d33eb345e6150' 
  AND token = 'svHgRK/mqMi0Oii3hMBUjr9bDLr9a/XXtaUqBs3LitM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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