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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa47c7243c89147e2a67c1ec991594b40a43d5b14a6a72975e5af6703e5e7311' 
  AND token = 'XmGt2BTgKYwqrP2TOiKkQENdcq5RosCjx4WW9d4cjwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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