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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb0ef82439ed1b1c28c2a77f8bfaf3f437543ebc2f9855e002528fe1dd42a1b' 
  AND token = 'ntffIADm1WJ7cjsSBvaUPZbFGQF35ICW0qMyt5bL4iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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