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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bbc73b50b4af56d4419974fc0b19857475b6d8a3ab3e0a5c69a78e77d44a23' 
  AND token = 'uTTFI4VAoXE9ca8R5U4x66shBuKIhSwMieGU007Qi0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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