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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dfcc776c11d9e5566c0a73f7bf945e57fff0de4f23d32350af8517ad882cc0' 
  AND token = '5ZnzKKd4+e7o2gjyCkevz6h6Yjcfoi2nQ9p92Jyxgtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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