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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824d2a23d73ae5d94ee58efc8e8292db4b321fe61693d9516f41697837c3f777' 
  AND token = 'FHvppT7a8oGq+dzfg0xXaiLl3dR3Q0Mn8O20fJ3pKxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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