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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f996268cbbda6f2ab1038a47a37c72d24d7ef6d9cb56941b6708df38a3f70a' 
  AND token = 'Pdk6QfJbZWC/GXq33D1wUbDjMUz5asGni4FU6tT16+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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