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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc3986b60cb4bef5cb04798fe32e8883a5794df4a915f36c2f9000a25491b2' 
  AND token = 'gel20PAvS8f5yaLwkVNvGTeE46pypaemMgc35SXFDdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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