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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac872cc54d5e33c17bde1afcc0ff38e1ffc862a71f5c3eaed04dc1ab05c73e4a' 
  AND token = 'Aj8WfHePdpW3tgwmcZel/EMYwA4d1d8ZHvt+ALpArBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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