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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9fb7d2eb76c93d4cc8df1b949fff2ff3f10259ff98767dcb90f7cf98545c9c' 
  AND token = 'eExn3NPR582AXWAhJbQC1KwGZ26iMmkJYKbdmcKBooE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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