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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b600522cd3e6385ce7bb982ae834533280233b3e8a853f66f28ffaa47b7f23' 
  AND token = 'Tbqyw/6ApiHgmGYqlgyB1/J2aECR1IeGFOFO1zqb8J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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