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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042462e2b12117a13e0722b6f067b7d53e46da588199d1e2df2aecec77df9b30' 
  AND token = '75/bU1DVBktqvQdDR+6eGejcDN6R9EPb3UXQ1FgPr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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