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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a893ccccb2f65366fd9afdad0f2bda4af71a261a2e22174fb8d696ddf673de2d' 
  AND token = '2+j5PabLudPeCAT0PNdL2RbFfRO8zD7PWQnvPHtNb6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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