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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89e7dc6add9d7b5e6905d72cef97679cb992d54ae1411f24bca9c4cd17c674f' 
  AND token = '0jExR4Nq1vQwdkzVf0a81WWdiVWTAOs6BxN4uYjLVMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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