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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019a02f847ec5d745bce9be68a518fd0daba29fd5e47a16583ad136eb24f6b93' 
  AND token = 'HNw9m80PkK8Ca4XS25Mn/JhaqHPZrEXOzxwCjhwv758=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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