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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c18e96ba5fe87d075f45a7c0d65be7a8ecc52ef6b16bd9ca1057efa1944f5b' 
  AND token = 'oP0U7LPqxA2vRmvvGDXUcEvEqX7oa61faK1TsxBtCbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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