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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930bd87c9d900de755015d1c60868e43ba1d6fdc824442df25a1cab6ac499d1a' 
  AND token = 'esvGRzofNJBGZawRzmRV9gWussU4JnbRctMWbCZgY68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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