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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d65cfa25fdd59ffb1476c47a567667d4503f3522ae7c512bffbd08032f51b91' 
  AND token = 'Z7exsu3ipt0TpsRDrzClwraItS88tkbqL0cRWb5fE0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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