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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a020a66f44d1e8291ffe932d28b0f2cebcad045778156756a0d8b7890f2037' 
  AND token = '8uGqsLlPa5H0ZYjtfTyPES71M4v5JwO5U6vOiMW23Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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