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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c741f620f7c03a9464088542e90bb4d1fa9536f4a1f52dd07aeb4648e675ee' 
  AND token = 'y8K/s8C3WfEb+/ebQ7DqWn12y4foDq3/BPExLKFV2EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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