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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8cdcbdd561f00d6e32be887d35de30e6e7120967f4c330dced0c5340c91177' 
  AND token = 'hGQjwp70nrqPUKP5r+HEuCczOv3al2sI5YRt5v28ESo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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