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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037c56000e8f6c4e016cd2b436dfc2f306f433a9693259c9eaae90678633db7e' 
  AND token = 'R4mhlNVnJYfwQs5etdnF02a6NHyJUu9uer5kDM+XaqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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