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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4790b1e5fdf1f57a991d90e0aefc4237112c5228eeb7059da5f97f5d62a7e27' 
  AND token = 'moiWuJ/ZXal+rS8czg6zfmfldb7IgIde7amNso5qpPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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