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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ddb08a8823b16ad0e668de4ce493785e8d39789c8ee736685a21996da1b70d' 
  AND token = 'ZSoPA/lyqcWb3hXMe1zuxBJyZtA6xFcoK8v8ec6vey8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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