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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fbd9faeb7a33dc562d2ddc2eb874ddb13182f9e9f87dd156de410aff949bfb' 
  AND token = '25g6bj8ZAUjMEYMMIxMkHLpx5SiDRf50xNz67P7mFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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