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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf5462a351fc3f3e44f2811e738899573c9f7a43df101d12dff30e1879bbf99' 
  AND token = 'L3BCD7/hn1W8N7XdOdh0Xe+P84pWhz0pm1T1qQPB2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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