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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbb3030b1612e2b04fe50b6aa4ceeca1905b3342d6c4c7afc26ce1b4e6fa12a' 
  AND token = 'Al4dTgQlTFKa5Ooj0NP1xHNdQolBj9a8TK3XEswBvi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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