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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83659c08fc570a57da7f1863552eb22f3a937275f9eb07ada8ac913e1dcf7804' 
  AND token = '+9HKox/kLHQ7/9X+amVvjt76mSbDy7dJ48W5fhWc1Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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