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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b401574326f2fc4b0bb3911570d37aba0217e69e5ffb3cc97bd74d7b8e1798e' 
  AND token = 'itfI0vxHTDD5ruxCmlR+k369yZTmZLJ7c3r62H5bNNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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