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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec18fd29d5b8678ea6ce43bd5e244c5104ff4e19268384b528f8d97e851f518' 
  AND token = 'JHbxMzJuiHWwO0PKHwT4q4qBdvp8Bk7uqMptqsx63Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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