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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0058a418808da3106d5ca82e62581a321c6369a9a03f8084b1a1b8d23df0a3d2' 
  AND token = '9FSUl1mHs31luXBZrhciO/UIsHBSb9v+MVZZPgKgXRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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