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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd433f6a9df1b987de06d8db9d086ce547d84390d4da32a8a14c4813fb485f80' 
  AND token = 'PSzGALOiAHBCKel5VfXgKpeK3oS3xH8CwncFqSxtPNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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