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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e05866dde5a35e8357f1618ff33795ea782c52026f18e75553e423c0863d0b' 
  AND token = 'AcbME84BxsH6FEQ6mB23GJQzaK/eTpV9poIWKLGxJzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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