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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4e61d8904c5981f48a39072871ce2b87d58b7527a13adb3ab85226b2ded788' 
  AND token = '/jMN0cKFtLGkelWENsEf+5MccRbyfJ/OQrVZLUsoKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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