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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbaedddd19be92a3c5fe1567d1dd964745a3d1dbf0933ea4f97e676a98071ee' 
  AND token = 'trztkMv3FZYszrmotGa8ZjjctMkuxinPbGiwQwg2fkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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