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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22765cd246a48e050f0a0c62af3883e471ccc12fda6913fc04d207f1b3628bca' 
  AND token = '/9WIjuN9+QBN2G8cL0Am2aciTX3bPWG08dzfG8cdOHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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