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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f31905f745744c1e0f9b2d2c1073cb0d233114c6f94ab1fc325a673f268acf' 
  AND token = 'fzKdoBblriQnrAsKEx3X4MkZQIVn/zz5+Xw/L55vmck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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