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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29dd3dc0efe1324bab0e705dd4e470e98a4a7c4c5ec2583015b0cbe80c17769' 
  AND token = 'O+1aR2DykMtuYfHHmQuhcQTCe2xXycHa1At3r89zHtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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