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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba37e511b87461fc9adf6d12196be569eabb3408d799ebb5d0f1adbe2d10935c' 
  AND token = '6beuSozqeDmhyOd6eIPBtmbqFyp5d+To9t1jUF+st6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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