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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ebdb8e4b5fcae75a3bbde0acc7be66c32ae2954aa8b716b77433cc1029c6e8' 
  AND token = '3cXCLFo1+xqwdYh1mYgAtm4yz/qh/JNSv8oCj0v9QLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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