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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e638c097112349fe1f11149078e0cb88c9043f8a03334fb3d8335eb09375a169' 
  AND token = '5U1LC3laSodwQcMyXC8UikedcMMBU9TLNQixo3vsnmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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