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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeedd33cba50419df99a6efd3983bc99efee0650afcc1aa50efe7e8e87cf5c7' 
  AND token = 'gFHGwrYtEgfraBvQ8ZypR0urRM+xpLvHjNVbm7cWifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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