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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72050bebb50c10c660a772031e73d562fa65aee5ae8d0481e5d2078d0d9fac1' 
  AND token = 'hHDBGrtUGdy1nXGzlkv9fbNVxe6OTZn1J4Xx70HmRTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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