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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b30b1f4e3a668eecf67cfc0404eb5e9ab33a86d4240e45ed9de98d3a43c8f71' 
  AND token = 'hZ1pxlU9nWxXfiF1kyJ71TKPqwL//PY7137qcseV+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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