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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee99d9eec2ddcfa904d739a68e113639cbde0cc7bf85cc7462241c254744341' 
  AND token = 'ApqOr0hNcjzhkhppVTI++7k4Av2lAR2iPfT0+aWHaI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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