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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15802860464c1812f74ee27828dd2e6b9b995ca5be90aa25f500e9c5913aae0d' 
  AND token = 'Ug6zE4s5mRSso9NXJ2RpL46ZAZymWV+dOI/piAsF1u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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