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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb18d0c4c06d03060f7971282370c8f6664e2a60dcd4532b18690b85089b79a' 
  AND token = '3ABan0AxMZjP7C44MGhS+DJnQqOLMxrOGt3Xet4Q/l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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