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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff9f6d6d8c0e9155e7fade95d0862a57beeff6af83a21c2b1cb73274df1d991' 
  AND token = 'oWcGA5ArdQ/UbWUkwtK5Kxj8TA/Vk8msy6FhgB58bIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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