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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c686679d963edc7a6518cf690cb0c04f0585faf28e206ccade6e5c8a391793' 
  AND token = '6WR6ZUm9IDu33DYvRyt+gKNCo1tZ7xui5bL4Y86DjeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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