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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac986dd31b769736d1bf4bb1e068a7b9d54ab16413f32596d525bde25795cdf' 
  AND token = 'StCKu54kl3jfgbjepLnaTySYkir4twBRljZL8xgmaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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