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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5044888bac3014508e4704af7dbd965194e6d3d16841147c38ef98c7e6e22fae' 
  AND token = 'nt6VGl9qgN55DWI+qz+DxZWx7UsZee/y8myGf+c77kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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