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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a1ce0173b5d1f7c87fb6851e13739287176d77d55624bc3df53ffcf417e88f' 
  AND token = 'G0pU5GnuHDP3Y5J9Rl/PPYJbCjTzy4qPkx73vqX7Fi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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