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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3f92dc2040f94b1fccffebb7edfebdf05873953f9e87b3b6d65a5a8349ff2d' 
  AND token = 'dt2qWtUdDACc9X/6hzMkzIUFTak79PO0dsUpMmX2u2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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