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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eabd13b0cdae7713ff2b62e1bcef404f9faacd2f98b77978514b345108f183' 
  AND token = 'I03unoOzcd64k8iRuaO3sqA99OZBJXY0g0Whsi8tL74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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