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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bef782c12df812feffaf178a2eb5102ce5f1594039227ab6833c0a7d8b00b84' 
  AND token = 'Z31qYnLeRqPr5ejwjw5/Y3LyLI4Rn/kH2tJFJwtMZsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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